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<!DOCTYPE html> <html> <body> <h2>JavaScript setInterval()</h2> <p>使用 setInterval() 每秒显示一次时间（1000 毫秒）。</p> <h1 id="demo"></h1> <script> setInterval(myFunction, 1000); function myFunction() { let d = new Date(); document.getElementById("demo").innerHTML= d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds(); } </script> </body> </html>